Pentecostalism, charismatic religious movement that gave rise to a number of Protestant churches in the United States in the 20th century and that is unique in its belief that all Christians should seek a post-conversion religious experience called “baptism with the Holy Spirit.” Recalling the Holy Spirit’s descent upon the first Christians in Jerusalem on the day of Pentecost, or Shabuoth (Acts of the Apostles 2–4), this experience appears to have been common in the Christian movement during its first generations. Baptism with the Holy Spirit is believed to be accompanied by a sign, usually the gift of tongues. This ...(100 of 2355 words)